Int 10/AH=12h/BL=36h

VIDEO - ALTERNATE FUNCTION SELECT (PS, VGA) - VIDEO REFRESH CONTROL

AH = 12h
BL = 36h
AL = new state
00h enable refresh
01h disable refresh

Return:
AL = 12h if function supported

Desc: Specify whether the contents of video memory should be displayed on the screen; disabling refresh effectively blanks the screen

Note: When display refresh is disabled, the entire screen displays the color specified by the DAC color register 00h; thus to actually blank the screen, the application must first ensure that that register has been set to black

BUG: GEM/VIEWMAX ET3000 and ET4000 drivers dated 1988/6/23 do not correctly reenable refresh after the screen has been blanked due to inactivity, resulting in a total loss of video synchronization

See Also: AX=BF05h

Category: Video - Int 10h - V

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